Servings: Oral: 0.5 to 10mg/day depending up on the severity of the condition. I.M. or I.V.: 0.5 to 20mg/day I.M. or as slow I.V. injection depending up on the severity of the condition; repeated as required up to 80mg/day. Antiemetic: 4 to 8 mg by mouth immediately before moderately-emetogenic chemotherapy and 20 mg by intravenous injection for more severely emetogenic chemotherapy. Children: 100mcg to 500mcg/kg/day